[Pacemaker] [RFC] Automatic nodelist synchronization between corosync and pacemaker

[Vladislav Bogdanov]

Sorry for being annoying, but... bump.

18.02.2013 10:18, Vladislav Bogdanov wrote:
> Hi Andrew, all,
> 
> I had an idea last night, that it may be worth implementing
> fully-dynamic cluster resize support in pacemaker, utilizing
> possibilities CMAP and votequorum provide.
> 
> Idea is to:
> * Do not add nodes from nodelist to CIB if their join-count in cmap is
> zero (but do not touch CIB nodes which exist in a nodelist and have zero
> join-count in cmap).
> * Install watches on a cmap nodelist.node and
> runtime.totem.pg.mrp.srp.members subtrees (cmap_track_add).
> * Add missing nodes to CIB as soon as they are both
> ** defined in a nodelist
> ** their join count becomes non-zero.
> * Remove nodes from CIB when they are removed from a nodelist.
> 
> Certainly, this requires some CMAP values (especially votequorum ones
> and may be totem mode) to have some 'well-known' values, f.e. only UDPU
> mode and quorum.allow_downscale=1, that should be defined yet.
> 
> May be, it also have sense to make this depend on some new CMAP
> variable, f.e. nodelist.dynamic=1.
> 
> I would even try to implement this if general agreement is gained and
> nobody else wants to implement this.
> 
> Can you please comment on this?
> 
> Vladislav
> 
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